Vox billing more than the cancellation period

I requested to cancel my Fibre service for the 9th of March and put my cancellation request on the 3rd of Febraury at least 35 days before the required cancellation date. when contacting Vox i was told the cancellation request is only applicable from the 1st of March and would need to pay for the service for the full month of March even though i am moving out of my property on the 9th of March. Vox hides behind a ambiguous statement of one calendars month notice and requires users to pay for a full month for services even though the service is not provided for the full month. the practice is not stipulated in the terms and conditions as the only cancellation clause provides details on cancelling a contract a not for month-to-month agreement. the cancellations department make up the rules for month-to-month cancellations as they determine the rules that best profits them as i cancelled another service last year and was only charged pro-rata for the period.